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Project not cooking/building after renaming

Hello, I used this tutorial to rename my project: Tutorial
I can open it in Unreal editor, run it, but if I try to package it I get this error:

MainFrameActions: Packaging (Windows (64-bit)): Program.Main: ERROR: AutomationTool terminated with exception:
MainFrameActions: Packaging (Windows (64-bit)): Program.Main: ERROR: Exception in mscorlib: An item with the same key has already been added.

I tried a few things but nothing worked so far. Any ideas how to fix it?

EDIT: Fixed by deleting Intermediate\Source folder.